For the following situation, identify the individuals under study. That is, who or what are we collecting data on?
The boll weevil had traveled from Central America to the United States and infested all cotton growing areas by the 1920's. After World War II DDT was used to control boll weevil populations. Unfortunately, DDT has some very adverse environmental impacts. Entomologists want to determine if fire ants can be used to control boll weevil populations. Forty geographically distinct cotton growing farms are randomly assigned to receive either DDT treatment or the introduction of fire ants. At year's end the yield per acre is found for each of the 40 farms.
a) Boll weevils
b) Fire ants
c) Cotton growing farms
d) Entomologists
